This Specimen has been sold.
1.3" Cretaceous Echinoid (Phymosoma) Fossil - Texas
This is a fossil echinoid (sea urchin) of the species Phymosoma texanum from the Lower Cretaceous Walnut Formation in Comanche County, Texas. This echinoid is in excellent condition and measures 1.3" wide.
Sea urchins are a type of echinoderm which are still living relatively unchanged today. They live at the bottom of soft ocean floors and have long spines protruding from their central body. They move along the bottom of the ocean using many small feet while feeding on various plant and animal matter.